Algorithm 1 Complete algorithm with TFADGAN and SR method

Input: HR thermal image $I_h^{real}$, Unpaired LR thermal image $I_l^{real}$

Output: Degraded LR thermal image $I_l^{dg}$, Reconstructed HR thermal image $I_h^{sr}$

1: for i in range(N) do

2:    Select unpaired HR thermal image $I_h^{real}$ and LR thermal image $I_l^{real}$

3:    Train TFADGAN to generate degraded LR thermal image $I_l^{dg}$ corresponding to HR thermal image $I_h^{real}$ and compute total loss in Equation (13)

4:    Update TFADGAN

5: end for

6: for i in range(M) do

7:    Select the degraded LR thermal image $I_l^{dg}$ and paired HR thermal image $I_h^{real}$

8:    Train SR network, generate reconstructed HR thermal image $I_h^{sr}$ and compute reconstruction loss

9:    Update SR network

10: end for